Rotary blower.



PATENTED MAY 14, 1907.

T; w; GREEN. ROTARY BLOWER.

APPLICATION FILED SEPTJB, 1906.

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PATENTBD MAY 14, 1907.

T. w. GREEN. ROTARY BLOWER.

APPLICATION FILED SEPT. 18, 1906.

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ATTORNEY.

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UNITED STATES PATENT OFFICE.

THOMAS W. GREEN, OF PHILADELPHIA; PENNSYLVANIA, 'ASSIGNOR TO WILBRAHAM-GREEN BLOWER COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

ROTARY BLOWER.

Specification of Letters Patent.

Patented May 14, 1907.

To all whom it 77mg concern: Be it known that I, THoMAs W. GREEN, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Rotary Blowers, of which the following is a specification.

This invention relates to improvements in rotary blowers, gas exhausters, etc., and has particular reference to a device wherein the lock between the inlet and outlet openings is formed by a stationary member, a rotary member having locking means thereon, and the impeller blades of the device.

The object of the present invention is to provide a device whereby the volume of air or other fluid delivered therefrom will be increased and an even and steady flow maintained during the operation of the device.

Further objects of the invention are to provide a neat, compact, reliable, efficient, and comparatively inexpensive device; and one that may be quickly and easily assembled, or dismembered for the purpose of repairs or cleaning, or for moving.

To these ends the invention consists in the novel construction, arrangement, and combination of the several parts of the device as hereinafter described, illustrated in the drawings, and more particularly pointed out in the claims hereunto appended.

In the drawings: Figure 1. is a vertical cross-sectional view showing the co-acting parts of the device in one of the many positions assumed by them during the operation. Fig. 2 is a similar view showing said co-acting parts in a different position. Fig. 3 is a vertical central longitudinal sectional view showing the operative parts thereof in the position shown in Fig. 1. Fig. 4 is a view of the impeller blade support or holder. Fig. 5 is a detached view of the lower portion of one end of the casing, the rotary locking member being removed, showing a flat ring or annular plate having two oppositely disposed ports therein, and an air passage. or channel connecting said ports.

Referring to the drawing by numerals, 1 indicates the casing of the device, formed, preferably, to the shape shown in Figs. 1, 2, and 3, wherein the outer wall or circumference 2 of the casing is practically circular with the exception that at the bottom thereof there is a dropped section 3 formed u on the arc of a smaller circle, while the inner wall or circumference 4, which forms the stationary member, is circular and .concentric with said outer wall 2 with the exception that at its bottom there is a raised or cut-in section 5 formed upon the arc of a circle of the same diameter as is the dropped section 3, and is so positioned that the circumference of said circle will form a part of it and said dropped section 3, as shown in the drawings, Figs. 1, 2, and 5. The numeral 6 indicates the removable end of said casing, and extends entirely over the ,end thereof as shown in Fig. 3.

In the vertical wall 7 of the casing is, preferably, an annular groove or channel 8 into which sets a fiat ring or annular plate 9 having ports or openings 10, 10, therein. These ports are oppositely disposed, as shown, and afford. communication between the channel 8 and the interior of the casing, as is apparent.

The numeral 11 indicates a rotary member, the diameter of which is the same as the diameter of the circle on which the sections 3 and 5 are formed, and its circular head 11 sets in a circular seat partially formed by said sections 3 and 5, and positioned therebetween, as shown in Figs. 1, 2, and 5. This rotary member 11 comprises a circular head 11, and a spiderlike locking member carried thereby, said spider-like locking member being so positioned on said head 11 that the ends 13, 1.4, of the curved wall 12 will successively contact with and sweep the sections 3 and 5 during the rotation of said rotary member 11.

The numerals 15 and 16 indicate radial wings, abuttingagainst the curved wall 12, and are of such length and so positioned that they willsuccessively contact with and sweep the sections 3 and 5 when said rotary member is rotated. The curve of said wall 12 is formed on the arc of a circle, and is of such curvature as to permit the passing of the impeller blades therethrough. It will be observed that said spider'like locking member has four contact or looking points, and that at least two of these will always be in position to maintain a lock between the inlet and outlet openings of the device, as shown in Fig. 2, while all four of them are in looking position twice in each rotation, as is shown and will be evident in Fig. 1. As shown in Figs. 1 and 2 there are 4 spaces a: formed by the configuration of the spider-like member, and each of these spaces is provided in the head 11 with a port which is diametrically opposite the port in the opposite space, and

these diametrically opposite ports are adapted to register with the ports 10, 10 in the plate or ring 9, for a purpose hereinafter stated. These ports are numbered. 17, 18, 19, and 20.

The numeral 21 indicates the frame on which said. casing 1 is supported and in which the means for operating said blower are mounted. 22 indicates a shaft journaled in suitable bearings in said frame and has one end thereof rigidly secured in the head 11 of said rotary member 11. The numeral 23 indicates the main driving shaft also journaled in a suitable bearing in said. frame 2], and, preferably, geared with said shaft 22, by a chain and sprocket gearing 24, although other forms of gearing may be used for this purpose, if so desired- One end of the shaft 23 is provided with a suitable pulley 25, or other means, for communicating rotation thereto from any suitable source of power. The opposite end of said shaft is, preferably, reduced to receive and carry the impeller blade support or holder 26, carrying the oppositely disposed impeller blades 27, as shown.

It is evident that the casing 1 instead of being constructed in the form shown in the drawings, Figs. 1, 2, and 3, may be varied to the extent of replacing the wall 4:, which constitutes the stationary member, by a sold or removable member of the same configuration. It is also evident that there may be a number of variations in the shape, in cross section, of the spider-like locking member, and I therefore, do not wish to be understood as limiting myself to the exact construction shown.

The operation of the device is as follows: The device being started the air, or other fluid, will be drawn into the interior of the casing 1 through the inlet opening a, and will be carried therethrough in the direction of the arrow by the rotation of the impeller blades 27, and forced out through the outlet opening I). During the operation of the device the outer ends of the impeller blades 27 will sweep the interior surface of the wall 2 from the point 0 to the point (1, and the inner ends of said impeller blades will sweep the inner surface of the wall 4 from the point 9 to the point it, and may, if so desired, be arranged to sweep said walls from the points e tof and'k to Z, respectively, but in practice I find that this latter is not necessary to the effective working of the device. The shafts 22 and 23 are so geared that when the rear ends of one of the impeller blades 27 reaches the point I the end 13 of the curved wall 12 will also be at the point Z, whereby the impeller blade 27 will be permitted to pass within the curve formed by said wall 12 and as the position of the same is shifted during the rotation of said. rotary member, and out to the opposite side of said member, as is apparent, thus allowing the impeller blades to make a complete rotation.

It will be apparent that, when the device is operated, a portion of the air in front of t be moving im-peller blade will be driven into such of the spaces at in the spider-like member as are exposed at the outlet side of the device, and. that as said member is rotated the air which is under pressure in said space or spaces would. ordinarily be carried to the inlet side of the lock, which would, of course, lower the efliciency of the device. To avoid this I provide the ports 17, 18, H), and 20, one in each of said spaces ac, as stated, and as the member rotates, one of the ports, 17, will register with the port 10, and the diametrically opposite port, 19, will register with the port 10, whereby the air, or other fluid, will flow through the ports and passage 8 to the diametrically opposite space :1? and thence passed to the outlet side of the look, as is apparent, thus maintaining the elliciency of the device.

Having thus described my invention what I claim is 1. In a device of the character described, the combination with a stationary locking member, and. a pair of oppositely disposed impeller blades, of a rotary spider-lil e locking member comprising a curved wall formed on the arc of a circle of less diameter than that of the rotary member, and win extending from the convex surface of said all to the circumference of said rotary member, the ends of said curved wall and wings being adapted during the rotation of said rotary member to maintain a continuous loek between the inlet and outlet openings of the device and at the same time permit the passage therethrough of the impeller blades.

2. In a device of the character described, the combination with a stationary locking member, and a pair of oppositely disposed impeller blades, of a rotary spider-like looking member comprising a curved wall formed on the arc of a circle of less diameter than that of the rotary member and having its ends terminating in the circumference of said rotary member, and wings extending from the convex surface of said wall to the circumference of said rotary member, the ends of said curved wall and wings being adapted during the-rotation of said rotary member to maintain a continuous lock between the inlet and outlet openings of the device and at the same time permit the passage therethrough of the impeller blades.

3. In a device of the character described, the combination with a stationary looking member, and a pair of rotary impeller blades, of a rotary spider-like locking member, comprising a plurality of contact making walls providing spaces therebetween, each of said spaces being provided with a port, a ported channel adapted to register with the ports in said spaces, whereby the air under pressure entrapped by a space leaving the outlet side of the blower will beconveyed through said channel to the opposite space about to be opened to the outlet side of said blower, thus all air entrapped under pressure is returned to the outlet side of the blower.

4. In a device of the character described, the'combination with a crescent shaped stationary locking member, and a pair of rotary impeller blades, of a rotary spider-like locking member, comprising a plurality of contact making walls, providing spaces therebetween, each of said spaces being provided with a port, a ported channel adapted to register with the ports in said spaces to establish connection between the o positely disposed spaces of said rotary loc ing member, whereby the air under pressure entrapped by a space leaving the'outlet side of the blower will be conveyed through said channel to the opposite space of said rotary member about to be opened to the outlet side of the blower, thus all air entrapped under pressure is returned to the outlet side of the blower.

5. In a device of the character described, the combination with a stationary locking member, a pair of rotary impeller blades, of a rotary locking member having spaces or recesses therein, ports in each of said spaces or recesses, a ported channel adapted to register with said ports to connect the oppositely disposed spaces or recesses in said rotary member, whereby the air under pressure entrapped by the space or recess leaving the outlet side of the blower will be conveyed to the oppositely disposed space or recess about to open to the outlet side of said blower to return said air to the outlet side of said blower.

6. In a device of the character described, the combination with a rotary locking member having a plurality of spaces or recesses therein, and a suitable port in each of said spaces or recesses, of a ported channel adapted to establish communication-between the oppositely disposed spaces or recesses of said rotary member, whereby air entrapped in said spaces or recesses from the outlet side of the blower is returned thereto.

In testimony whereof I affix my signature n presence of two witnesses.

THOMAS W. GREEN. 

